Investigation of the coupling between tunable split-ring resonators
Investigation of the coupling between tunable split-ring resonators
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DOI：
10.1103/physrevb.98.085146
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发表时间：
2018-08-28
影响因子：
3.7
通讯作者：
Barnes, William L.
中科院分区：
文献类型：
--
作者：
Baraclough, Milo;Hooper, Ian R.;Barnes, William L.
被动共振超材料受到它们所支持的共振的窄带性质的限制。在这里，我们表明，通过将一个积极的组成部分到常用的开口环谐振器的结构，它是可能的，以调整这种类型的超材料原子的谐振频率。我们利用这种可调谐性来检查两个谐振器之间的相互作用，一个被动的和一个主动的，因为主动谐振器的谐振频率被扫过被动谐振器的谐振频率。这种耦合系统的所得模式表现出一个anticrossing，并通过改变分离之间，和相对取向，开口环谐振器，我们调查如何磁和电耦合项的变化。我们发现，谐振器的相对取向显着影响耦合的强度。通过结构调谐和主动调谐，我们能够改变耦合项的相对大小和符号。我们希望这些变化的性质将有助于那些设计大型主动可调超材料系统。
Passive resonant metamaterials are limited by the narrow-band nature of the resonances they support. Here we show that by incorporating an active component into the structure of the commonly used split-ring resonator it is possible to tune the resonance frequency of this type of metamaterial atom. We make use of this tunability to examine the interaction between two resonators, one passive and one active, as the resonance frequency of the active resonator is swept through that of the passive resonator. The resultant modes of this coupled system exhibit an anticrossing and, by changing the separation between, and relative orientation of, the split-ring resonators, we investigate how the magnetic and electric coupling terms change. We find that the relative orientation of the resonators significantly effects the strength of the coupling. Through both structural and active tuning we are able to alter the relative sizes and signs of the coupling terms. We hope that the nature of these changes will be of use to those designing large actively tunable metamaterial systems.